Ambulance, ute towing boat crash in Rosedale, Auckland

Three ambulance officers needed hospital treatment after a crash on Auckland's North Shore. Photo / Hayden Woodward

An ambulance is on its side after a crash involving a ute towing a boat on Auckland's North Shore this afternoon.

It's not yet known if anyone has been badly hurt in either vehicle after the 12.15pm crash on Constellation Dr in Rosedale, police say.

A passerby told the Herald the crash occurred on an off-ramp at the motorway interchange between Upper Harbour Highway and State Highway 1.

St John Territory Manager Andrew Everiss said the ambulance was responding to a patient and under lights and siren at the time of the crash.

A second ambulance was dispatched to the initial patient after the incident.

"The ambulance officers and the member of public in the other vehicle have been assessed at the scene by additional ambulance crews. Three ambulance officers have been transported to North Shore Hospital with moderate and minor injuries while the person in the other vehicle was assessed with minor injuries.

"St John takes the health and safety of our patients and ambulance officers very seriously and we are providing support to those involved.

"St John is investigating the incident and working with New Zealand Police."